Add error handling for empty API responses

[labmain]

When the API returns an empty response body, the app crashes with an unhandled TypeError. Add proper null/undefined checks and show a user-friendly error message instead of crashing.

Acceptance Criteria:

• API calls handle null/undefined responses gracefully
• User sees a friendly error toast instead of a crash
• Add at least one unit test for the error handling path

[my-hunter-app]

💰 BountyPay — 50 USD1 Bounty Created!

This issue now has a $50 USD1 bounty on it.

Acceptance Criteria:

1. API calls must handle null/undefined responses gracefully without crashing. 2. User sees a friendly error toast instead of a crash. 3. At least one unit test for the error handling path.

How to claim:

1. Fork the repo and fix the issue
2. Submit a Pull Request referencing this issue
3. Go to BountyPay Dashboard to claim the bounty
4. Once your PR is merged, payment will be sent to your wallet automatically

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[D2758695161]

Bump - Ready to merge

These PRs cover active bounty issues (total $466+ USD):

• PR test: add comprehensive E2E parser tests (#30, #21) #33: E2E tests for E2E Test 17:35:55: Automated test #21 + E2E Test 17:54:11: Automated test #30 (merged PR fix: correct package.json name to ai-agent-pay-demo #7 proves you review)
• PR feat: add dark mode toggle and loading spinner (#11, #18, #19) #34: Dark mode + loading spinner + theme toggle for Implement dark mode toggle in settings page #11, Add loading spinner to bounty list page #18, Support dark/light theme toggle #19 ($150 bounty)
• PR feat: add error handling for empty API responses (#35) and verification test (#37) #51: Error handling + verification tests for Add error handling for empty API responses #35, Test 19:52:49: Manual verification #37 ($116 bounty)

All PRs are mergeable with no conflicts. Happy to adjust anything.

Wallet for bounty: 0xaae0101ac77a2e4e0ea826eb4d309374f029b0a6 (USDT/ERC20)

Thank you!